Carburetor



April 1929. c. v. ELLIOTT 1,707,350

' CARBURETOR Filed Jan. 21, 1924 2 Sheets-Sheet 1 dttoz .1

April 2, 1929? 3, v, ELLIOTT V 1,707,350

CARBURETOR Filed Jan. 21. 1924 2 Sheets-Sheet 2 Patented Apr. 2, 1929.

CLARENCE v. ELLIOTT, or nos Anentns, cnmronnm.

GARBURETOR.

Application filed January 21, 1924. Serial No. 687,646.

This invention relates to carburetors tor flows through a small opening 22. When the automobiles, and is more particularly directed to a carburetor having a simple construction and relatively few parts.

larburetors now employed in connection with internal combustion engines are, for the most part, of very complicated structure with line adjustments that are easily rattled or jarred out of place, greatlyail'ecting the operation of the car.

An object of this invention is to produce a carburetor having a very few parts.

An object of this invention is to produce carburetor in which there is required no adj 1155151116111 i An objectalso is to provide a carburetor having a metering orifice so constructed that change of temperz'itiure ot' the liquid does not ali'ect the flow o1. liquid through the carburetor.

Uther objects will be apparent from the following detailed description of a preferred embodiment of this invention, 01 which the aceon'ipanyin g drawings are a part.

In the drawings: I i

Figure 1 is a sectional side elevation of. a carburetor embodying this invention.

Fig. 2 is a sectional end elevation thereof alien substantially on the line 2--2 of Fig. 1.

Fig. 3 is a sectional side elevation showing a modifiedembodiment or this invention, and showing needle valveadjustment for the idle :i'low oi fluid when a main intake valve is cli'lsed. i

i Fig. 1 a sectional end elevation of the carlimretor shown in ldigu re 3 and taken substau-= tially on the line a d Fig. 3.

Fig. 5 is a sectional plan view of the embodimentof the inventionshown in Figure El.

Fig. 6 is an enlarged sectional view of the i'i'ietering orifice and flow tube as used in connection with this invention. 1 1

Referring to the drawings,1 represents the body 01 the carburetor, which is a hollow member with a Venturi-shape passageway 2.

3 represents a butterfly throttle of the usual construction for controlling the amount oi mixture passing through the engine. 4 repre' sents a choke "valve for temporarily enriching the mixture when starting the engine. 5 is a fuel container attached to a cover 6 by any suitable means, as shown at 7. The cover. 6 may be a part ol the body 1 ora separate piece fastened to the body 1 by any means, such as the screws 8.

The fuel entersthe float bowl at 21 and incl reaches a predetermined level, a float 10 1s ra1sed against a lever 20, the said lever bemg supported at one end by the screw 18.

1 11611 said lever 20 is raised by the float 10,

the said lever 20 pushes the needle 19 against its seat 28 and prevents the further inflow ot' the fuel. This mechanism serves to keep a practically constant level of the fuel in the float bowl 5; however, thismechanism diil'ers little from that now used in the art and no novelty is claimed for it.

12 is a hollow screw which may be screwed or otherwise secured to the float bowl cover 6. Hold between the head of the screw 12 and the float bowl cover 6 is a length of tubing 11, said tub ng 11 havmg an orifice 13 in its lower end and a second orifice 17 at the upper end. The orifice 17 might be replaced by two orifices of equal area, or might be drilled in the float bowl cover. The hole lilis a metering orilice for the admission of the fuel from the fuel container 5 into the interior of the hollow tubing 11,while the orifice 17 admits air into the interior of the said tubing 11; air being admitted to the upper portion of the fuel container 5 through a hole in the cover 6,

The fuel passing through the orifice 13 is d awn through the series of orifices 1d positioned in the lower portion of the hollow screw 12.. Air drawn through the orifices 17 enters the hollow screw 12 through a series of holes 15 positioned in the screw 12 near the level of the 'luelin the container 5. The holes 16 positioned intermediate between holes Ll and 15 and the hollow screw 12 serve to allow either the :tuel or air, or a mixture of fuel. and air, to be drawn into the interior of the hollow screw 12 at this point The fuel, having been admitted into the interimrof the hollow screw, is drawn upward through the screw 12 by the partial vacuum created by the engine and isdischarged either through the bypass 24: or through the single opening 27:

In, the COllShlUt'ilLlOll of this carburetor, I have found that the correct relation of the parts'to eliminate the necessity of line adjustments to be approximately in the following proportions:

The Venturi-sh ape passage 2 should be .694

inches in diameter; the discharge opening27 should be .156 inches in diameter, the holes 1.4;, 1.5 and 16 and the hollow tube 12 should be .042 inches in diameter; the metering orifice 16 should be..039 inchesin diameter; the

port-ions specified. V

In the embodiment of this invention shown orifice 17 should be .042 inches in diameter; and the bypass discharge 24 shouldhave a diameter of .042 inches in diameter.

These sizes are cited to more easily enable one skilled in the art to construct a carburetor in accordance with the discovery embodied in Figures 3, land 5,. I prefer to use a'tube pressed in the body 1 so as to extend across the restricted metering orifice 2 of the air passageway. In the sides of the tube 5' are one or more holes 6, which holes,,combined, are to have approximately the same discharge I area asthe discharge opening 27 shown in Figurel." One end of the tube 5 is in communication with the interior of the hollow screw 12. The'ot-her end of the tube 5' connects with the by-p'ass passageway 23' formed in the body I.

f The by-pas's 23 has an outlet 24, into the space between the throttleandthe engine.

The size of the opening between the by-pass and the tube 5 may beregulated by the screw 29; however, I have discovered that by "adhering to the relation of parts heretofore specified, the screw 29 is not a necessary part of th s invention.

The operation of this carburetor is as follows 'lVhen thelengine iscranked, the throttle 3fis partly open and the choke 4 is partly closed; A suction will be produced in the air passageway v and will 1 be transmitted i through the by-pass '2 land the discharge opening 27 orthe holes 6 to the interior of thetube 5, thence to'the hollow screw 12.

- Fuel will be drawn through some of the holes I in the'sc1'ew"12, to which it is supplied by the 1 metering orifice 13. Air, at the same time,

will be drawn through the upper hole 15, to which itis supplied by the hole 17 and the hole 25 in series. Themixture of fuel and air formed inside the hollow screw 12 will be drawnup and discharged into the main air passageway through the discharge opening 27 or hole 6, or through the by-pass opening 24, depending upon the position of the throttle.

The principle embodied in this invention isthat themetering orifice 13, cut in the thin hollowtube 11, allows the 'flow of the fluid fuel into theinterior of the tube 11 without alter 7 dueitcf the volnrne of fiuid fuel admitted hange in temperature or density of thegfluid. 1'

- 7 The holes 15 positionedin the screw 12 approximatelyat-fthe levelof the fuel in'the' container, cause a more eflicient mixing of the fluid fuel with air, admitted through the holes 17 and 25 in series, securing a mixture of fuel and air that is more easily drawn into the engine, on starting the engine, or on acceleration of the engine.

I-Iaving fully described a preferred embodiment of this invention, it is to be understood that I do not wish to be limited to the construction herein disclosed, which may be varied in detail without departing from the spirit of the invention, as pointed out in the appended. claims:

hat I claim is:

1. In a carburetor, the combination of a body, a passageway through the body, a. fuel container, means for admitting fuel into the fuel container, means for controlling the flow of fuel into the fuel container, means for admitting air into the fuel container, an inner tube having a fuel inlet, and upper and lower air inlet ports, an outlet for the inner tube into the passageway in the body, a throttle valve mounted in the passageway, a by-pass formed in the body in communication with the inner tube and extending to the discharge side of the throttle valve, an outer tube exterior of and spaced from the inner tube, a fuel inlet formed in the wall of said outer tube, and means whereby the air admitted to the fuel container can enter into the space between the inner and outer tube.

2. In a carburetor, the combination of a body, a passageway formed through the body, a fuel container, means for admitting fuel to the container, means for controlling the admission of fuel to the fuel container, means for admitting air into the fuel container, an inner tube having a fuel inlet port and spaced air inlet ports, one of which inlet ports is located above the normal level of the fuel in the said fuel container, an outlet for the inner tube into the passageway formed through the body, a throttle valve mounted in the passageway, a by-pass in communication with the inner tube and the passageway on the discharge side of the throttle valve, an outer tube exterior of and spaced from the inner tube, a fuel inlet formed in the wall of the outer tube, and means whereby the air admitted to the fuel container can enter into the space between the inner and outer tubes.

3. In a carburetor, the combination of a body, a passageway formed through the body, a tube extending across the passageway, outlet ports formed in the tube in the passageway, a throttle valve mounted in the passageway, a by-pass from the said tube to the passageway and extending to the discharge side of the throttle valve, a fuel container, means for admitting fuel into the fuel container, means for controlling the admission of fuel into the container, means for admitting air to said fuel container, an outer tube, an orifice in the outer tube below the normal fuel level, an

inner tube within and spaced from the outer tube, means whereby the air admitted to the fuel container can enter into the space between the inner and outer tubes, an outlet from the inner tube to the said tube extending across the said passageway, and a plurality oi orifices in the inner tube, some of which orifices are above the fuel level in the. container.

4. In a carburetor, the combination, of a body, a passageway formed through the body, a fuel container, ineane ior adniittil'ig air into the fuel container, means for admitting liquid i'uel into the liquid container, means for controlling the admission of liquid fuel into the liquid container, an outer tube mounted with in the contain and having a fuel orifice, an

inner tube mounted within and spaced from the outer tube, air and fuel orifices formed in the said inner tube, a tube extending from the inner tube across the passageway, clischarge holes formed in the latter said tubein the said passageway, an outlet from the inner tube to the said tube extending across the passageway, a by-pass communicating with the inner tube and extending to the discharge side of the said body beyond the throttle valve, and means whereby the air admitted to the fuel container can enter the sgace between the inner and outer tubes.

Signed at Los Angeles, California, this 9th day of January, 1924.

CLARENCE V. ELLIOTT. 

